Hi My name is Jean-Louis, ZS6AAG i am experimenting with uplink to the satellite with antenna logarithnic 12db, one hackrf and one ampli 2.4ghz 8 watts from china, can i attack directly the wifi amplifier or i need something between the hackrf and the wifi amplifier, many thanks for your answer

So please, my dear friends, even if we are just amateurs, our goal should be to reach our opposite with the main lobe of our transmit power to be as effective as possible with radiant power ...And that includes clean radiation characteristics of our antenna systems ...

May I call you Schrödinger's Ham? You are right and wrong at the same time.

... nice

but true. We need the confirmation by experimental ... you did it.

Now the only problem left is that the stacking of 2 antennas means that the E-diagram is only half as high as the H-diagram, which leads to a non-ideal illumination of a round parabolic reflector, right?

Btw, the the example with the 4 LNBs was a joke ... We know that the profit of a parabolic system comes from the reflector surface and not the gain of the Feeds ...

I do not think so. They will act as an array, but each helix has its own lobe of radiation.stacking antennas results in a doubling of the antenna area in the simplest case, thus also a gain of 3 dB. The distance between the antennas is chosen so that the 3 dB opening angle in the radiation pattern does not disturb anymore.As long as the signals are sent on their way in parallel, you will receive a correspondingly focuised 3 dB profit at the receiver.

But, sent over a parabolic shaped reflector the lobes go apart and sprinkle ....

For a common focus of the array on a parabolic reflector I lack the physical justification, but I like to learn ... (stacking 4 LNB´s and gain rise up 6dB ? )

The Muldifeed holder is from my view the wrong approach. It can only be one of the two mounted feeds in the focus of a satellite. Mutifeed holders are intended for the reception of 2 satellites, which also have to be positioned a few degrees apart.